Ya'll don't need grab bars now, but you might someday. I strongly recommend having blocking installed in the bathroom walls everywhere that you think you might want a grab bar some day. I had them installed, although when I was your age, I never thought I would need them. They really, really make a difference.

It's great that the existing bathroom is double the typical size so that you can make 2 bathrooms in the same area. No tub or shower in the south bathroom but a tub in the bedroom? How exotic! Be sure there's a lock on the BR door!

Yes, I know that's what you meant. There is no good reason to use it. I don't think it is cheaper or better wearing. I have installed several wood floors using raw wood. You have better control over the stain and finish techniques. Also can add a couple extra coats of varnish if desired.

It is nearly impossible to install a pre-finished floor without some mishaps. Also, they often have a slight beveled edge that makes them look fake and collect dust.

Go to Premium Wood Flooring in north slope/Sunset. Check prices for planks only. Ask your contractor and architect about it.

I have 4" white oak of a mid-quality grade. The better the grade, the more even and consistent the grain. Low grade is wavier in patterning, color changes and full of knots which can be easily filled. Finest grades have narrow, straight grain, consistent in color and have no knots.